We really have to do something with these plastic bags, it spoils nature so dramatically. So, first we have to cut the bottom of the bag. Try to leave the maximum of the bag intact. Second, cut off the handles, because they are very hard to iron. Now we have a square bag. Turn it inside out, it will not allow ink to mess the wax paper on the ironing stage. Fold it twice and add to more bags prepared like this. Now it is ready for the ironing process. Place bags between two pieces of fabric and cover with waxed paper. The iron must not be too hot, you have to set the right temperature, or waxed paper will stick to the plastic. Sewing process is final. You have now to sew together new bag.